Turret lathe



(No Model.) '4 Sheets-Sheet 2. P. A. LANE.

. TURRET LATHE. No. 476,205. Patented May 31, 189-2.

H WWW ml e MW) s Mill] If mm v mun mmunm 1 1 iillllllflllllllllllv x Awil (No Model.) 4Sheets-Sheet 3- P. A. LANE.

TURRET LATHE. No. 476,205. Patented May 31, 1892.

4 Sheets-Sheet 4- F. A. LANE. TURRET LATHE.

(No Model.)

Patented May31, 1892.

, UNITED STATES I PATENT OFFIC FREDERIC A. LANE, OF NEW HAVEN,CONNECTICUT.

TURRET-LATHE.

SPECIFICATION forming part of Letters Patent No. 476,205, dated May 31,1892.

Application filed August 13, 1891- Serial No- 0Z,5 7- (N modeL T0 atwhom it may concern.-

Be it known that LFREDEEIC A. LANE, of New Haven, in the county of NewHaven and State of Connecticut, haveinvented anew Improvement inTurret-Lathes; and 1 do hereby declare the following, when taken inconnection with accompanying drawings and the letters and figures ofreference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitutepart of this specification,and represent,

Fig. 1, a plan view of the front portion of the slide, showing themechanism and operation for arresting the retreating movement of thecarriage before it reaches its extreme point of retreat; Fig. 2, afrontview of the attachment and lathe complete; Fig. 3, atransverse sectioncutting on lineocx of Fig. 2, but showing the turret attachment in sideview and representing the turret and carriage at the extreme point ofretreat; Fig. 3, a similar View of the carriage, turret, and ratchet asthat of Fig. 3, except the position of the turret and carriage is atthat point where the pawl is just engaging a tooth of the ratchet; Fig.4, a partial longitudinalsection of the front end of the slide, showingthe arrangement of the stop 53, adapted to arrest the retreatingmovement of the carriage before it shall have reached its extremeretreating position; Fig. 5, a side View of a blank of' an arbor forclock-pinions as adapted for introduction to the machine for operationthereon; Fig. 6, the same after the operation of the machine iscompleted; Fig. 7, a top or plan View of the slide with the carriage andturret removed; Fig.8, an under side view of the carriage, showing thetoothed surface of the turret-plate r; Fig. 9, a transverse sectionthrough the turret, cutting on line 'y y of Fig. 3 near the carriage;Fig. 10, a longitudinal section through the forward portion of theslide, representing the plate 25 of the turret as engaging with the dog16 in the slide for the purpose of rotation; Fig. 11, atransversesection through the slide, carriage, and turret, illustrating theinterlocking mechanism between the turret and carriage; Fig 12, alongitudinal section through the front portion of the carriage, cuttingon line so as of Fig. 7.

Figure 1, a top or plan view of a lathe having the turret attachmentapplied thereto;

This invention relates to an improvement in a turret attachment forlathes for turning articles of various diameters and shapes, the

object being to provide an attachment for an ordinary lathe which may bereadily applied thereto and by which shaping or reducing articles ofcircular shape in transverse section may be readily produced; and itconsists in the construction and combination of mechanism as hereinafterdescribed, and particularly recited in the claims.

7 In illustrating the invention it is shown as adapted for turning thearbor and collets for lantern-pinions for clock-work.

In Fig. 5 a blank for such an arbor and pinion is represented and thefinished article in Fig. 6. The arbor a is usually made from wire of therequired diameter and in length slightly greater than that of thefinished article. Upon this arbor two collets b c areapplied, usually bycasting, these collets being somewhat larger than required for thefinished article. In turningthe blank to the finished shape gudgeons dare formed on each end of the arbor and the two collets. are reduced tothe required diameterandthickness, the collet I) being somewhat largerthan the collet 0, so as to form the hub for the gearwheel to beattached thereto, and this collet b is reduced to form a shouldere uponwhich the gear-wheel is set, the two collets being distant from eachother as required for the formation of the pinion, the pinion beingcompleted by drilling through the collet 0 into the collet b andintroducing wires to form the leaves of the pinion, this latteroperation being performed in the usual manner.

The machine of this invention is adapted to convert the blank, Fig. 5,to the shape of the finished article, as seen in Fig. 6.

A represents the bed of the lathe, B the head-stock, in which themandrel C is arranged and carrying the pulleys D and Ein the usualmanner.

F represents the tail-stock, which is arranged upon the bed in the usualmanner, and, as usual, is provided with a spindle G, which is adaptedfor adjustment longitudinally, so 'as to centrally hold the work betweenits inner end and the mandrel, as usual in this class of lathes.

The attachment to be applied to the lathe consists of a slide H,arranged transversely across the bed of the lathe and so as to slidelongitudinally thereon in the usual manner of the slide-rest of a latheand it is connected to the bed, so as to be held firmly thereon yetpermitted longitudinal sliding movement. As here represented, the slide11 is secured upon the bed A of the lathe by means of a binding-plate Iupon the under side of the-bed of the lathe, connected to the slidethrough the bed by a stud J or otherwise, so that the slide may be heldfirmly in its place upon the top of the bed, yet permitted to movefreely toward and from the head-stock. As here represented, thelongitudinal movement is imparted to the slide H by means of ahandleverK, hung upon a fulcrum L at the lefthand end of the lathe andconnected by a rod Mto the binding-plate l, the lever being ar-'rangedto swing in ahorizontal plane and so th'at the operator, applyinghis hand to thelever Kand moving that lever in such horizontal plane,will impart a corresponding lon-' gitudinal movement to the slide II.This movement of the slide is adapted for quick adjustment or movementof the lathe. In some ,cases, however, a regular feed is desirable, asin engine-lathes. To accomplish such regular movement of the slide H, aleadings'crew N is supported in bearings O below-the lathe-bed and whichreceives a continuous rotation through apulley P, arranged on theleading-screw or otherwise, it being understood that the screw isarranged for free rotation, but without longitudinal movement, and, asusual in lathes provided with a leading-screw, but that the slide may bemoved in either d'irection that is, toward or from the head-stockaportion Q of the screw toward one end is cut with a right-hand threadand at the other end B the screw is cut with a left-hand thread. Fromthe slide two stirrups S and T project downward, through which theleading-screw extends, they being connected to the slide by a spindleU,,(see

threaded corresponding to the right-hand screw-threaded portion Q of theleadingscrew N. Normally this half-nut stands above and out ofengagement with the screw, as represen-ted in Fig. 3, so held by thespring V, but yet so that by drawing the stirrup downward the nut V maybe brought into engagement with its screw-threaded portion of theleading screw N, and so that when so engaged the leading-screw willimpart to the nut a travel in the direction of the screw, which travelwill be communicated to the slide H. The other stirrup T is providedwith a like halfnut X, which may be drawn into engagement with the otherthreaded portion of the screw, so as to impart to the slide a movementin the direction opposite to that which would be imparted to it by theoperationof the screw upon the other nut W, this nut X beingheld up outof engagement with its portion of the screw in like manner as describedfor the nut W. To draw these nuts into engagement with their own portionof the leading-screw N, as may be required, a lever Y is hung upon afulcrum Z at one side of the stirrup S, the lever extending through thestirrup and over a bearing or anti-friction roll f in the stirrup,

and to the free end of the lever a foot-pedal is connected, as by achain g, so that the operator by his foot may depress the stirrup S anddraw the nut WV iutoengagement with its portion of the leading -screwwhenever required. A similar lever h is hung upon a f-ulcrum 1'- atone'side of the stirrup T and extends through the-stirrup and so as tobear upon an anti-friction roller 7c, in like manner as described forthe lever Y in the stirrup S,

and it is also in like manner provided by a connection Zwith afoot-pedal, so that the stirrup T may be drawndownward to bring its nutX into engagement with its portion ofthe screw, as required, thus by hisfoot the operator may bring either nut into engagement with theleading-screw, so as to impart to the slide a corresponding movementtoward or from the head-stock, as occasion may require.

Upon the slide H a carriage mis arranged and suitably guided, so as toreceive a reciprocating movement in a line transversely across the bedof the lathe, or at substantially right angles to the axis of themandrel and spindle and as usual in the-slide-rest of lathes. Thereciprocating movement is imparted to the carriage m by means ofahandlever a, hung upon a fulcrum 0 and so as to swing in substantiallyavertical plane. From the hub of the lever an arm p extends upward, towhich a link q is attached and connects the said lever with the slide m,and so that as the lever is moved up and down it will impart acorresponding forward and backward movement to the carriage m. Upon thiscarriage the turret r is arranged and so as to rotate in a horizontalplane-that is, the axis of rotation of the turret is vertical.The'turret is connected to the carriage as represented in Fig. 11. Theturret is constructed with a trunnion 8 upon its lower end, which passesthrough a corresponding seat in the top of the carriage, and upon theunder side of the trunnion a collar t is secured, the collar taking abearing upon the inside of the carriage around the trunnion, and so asto hold the trunnion firmly upon the carriage, yet permit rotation ofthe turret, the collar t rotating with it. The turret is provided with aseries of tools, as 2, S, 4:, 5, 6, 7, and 8, (maybe more or less innumber, according to the work required,) the tools being of the shape toproduce the proper out upon the article to be operated upon and arearranged radially in the turret and adj usted according to the work tobe accomplished. The rotation of the turret is such as to present eithertool as it may be required. The rotation of the turret is made automaticand is produced in the reciprocating movement of the carriage. Toproduce such rotation of the turret, the collar t upon the lower end ofthe turret is constructed with ratchet-teeth 9, 10, 11, 12, 13, 14, and15 upon its under surface, corresponding in number to the number oftools in the turret.

In the slide I-I below the collar 15 a vertically-movable dog 16 isarranged. (See Fig. 10.) This dog is a pin setin a corresponding cavityin the slide H and rests upon a spring 17, the tendency of which is toforce the dog upward. The nose of the dog is beveled backward and sothatits forward surface may engage the teeth of the collar 25.(Represented in Fig. 10 as engaged with the tooth 9.) This dog standsnearthe forward end of the slide H, but so that as the carriage mretreats the dog stands in the path of a tooth of the collar t, and whenthat tooth is so engaged with the dog 16, as seen in Fig. 10, thecompletion of the retreating movement of the carriage will cause thecollar 15 and the turret to rotate accordingly-that is, to the extent ofone tooth on the collar 25. Then on the next advance of the carriage thenext tooth, operating upon the bevel nose of the dog, will cause the dogto descend, so that the turret may escape therefrom, and then on thenext retreat the tooth which so passedover the dog will be engaged andthe next step in rotation imparted to the turret. A stop 18 is providedbetween the slide H and the carriage, (see Figs. 1 and 2,) which limitsthe retreating movement of the carriage'and so as to stop it at thepoint when the required tool is presented for work. WVhen the turret,has been thus properly adjusted, it is neces-'. sary to lock it to thecarriage, so as to prevent any accidental rotative movement of theturret in its next advance. To accomplish this object, the collar t isprovided with a series of pins 19, 20, 21, 22, 23, 24, and 25,corresponding to the numberof teeth on the collarthat is, with thenumber of tools or steps of rotation required for the turret. These pinswork freely through corresponding holes in the collar and in lengthcorrespond to the thickness of the collar, as seen in Fig. 11, and sothat normally they work between the under surface of the carriage andthe upper surface of the slide, as shown, for the pin 23 in Fig. 11. Inthe carriage above the collartand at a point corresponding to one of thepins-say 19-when the turret is at rest a follower 26 is arranged, (seeFig. 11,) which is of a size and shape corresponding to the said pinsand is provided with a spring 27, the tendency of which is to force thesaid follower 26 downward and so that when one of the pins, as 19, ispresented below this follower, as seen in Fig. 11, the said followerunder the force of its spring will have a tendency to force that pin 19downward. In line with the point where such pin, as 19, stands when theturret is at rest the slide is constructed with a longitudinal groove28, (see Figs. 7 and 11,)

which in width corresponds to-the width of the pins in the collar t, andso that when a pin stands over that groove, asseen in Fig.

11, the follower will force that pin downward into the groove 28 of theslide H, the follower itself entering the upper end of the hole of thepin which it has thus depressed, and, as seen in Fig. 11, the followerthus engaged with both the collar and the carriage firmly interlocksthetwo, so as to prevent the possible rotation of the turret while thusinterlocked. The pin thus depressed by the follower works through thegroove 28in the carriage, so as to permit the interlocking to continueduring the advance and retreating movement of the carriage.

In the groove 28 and near the forward end a stationary rise or cam 29 isformed, preas 19, then standing in the groove 28 will ride onto thestationary cam 29 in the groove and thus be forced upward and so as topress the follower into its recess in the carriage and out of engagementwith the turret and so that in the completion of the retreating movementof the carriage from this disengaged position the dog 16 will operate,as before described, to impart one step of rotation to the turret whenthe nextpin will be brought into line with the follower 26 and so thaton the next advance of the carriage that second pin will ride off fromthe cam 29 into the groove and permit the interlocking, as before. Thecam 29 is made of a length only sufficient to hold the follower out ofengagement with the turret while the rotation is being produced and sothat the pin may pass off from the other side of the cam again into thegroove, and so as to make the engagement with the turret sosoon as therotation has been completed, and so as to insure the rotation of theturret stopping at the proper point, for so soon as the next pin of thecollar comes below the follower it will be forced into the groove andthus arrest the rotation of the turret. Hence on the next advance thepin will ride over the cam, but again return into the groove before theturret shall have been advanced to bring the tool into operation. Theextensioun of the groove beyond the cam 29 at the outer end may beomitted, but is desirable as being a certain means of arresting therotation of the turret at the proper point.

To insure the registering position between the pins on the plate tandthe follower 26, the turret is constructed with a series of notches 30,corresponding to the number of tools, as seen in Fig. 9, and combinedwith these notches is a spring-dog 31, made fast to the carriage, thenose of which is adapted to engage one of the said notches whenpresented thereto, and as seen in Fig. 9, but yet IIO so as to yieldwhen the forced rotation of the; turret commences. The position ofthese; notches with relation to the nose of the dOgg corresponds to thepoint where the pins of,

the plate will register with the follower 26 of the carriage,zand sothat saiddog will tem-e porar'ily 'arresttthe rotation of the turretwhen; this registering position is attained and so as to force thefollower into engagement with theturret, as before described.

.As a rmeans for stopping theadvance movementeofthe turret whenever thetool shall have reached its required advanced position,i the turret isprovided with aseries of stops-321 below thecuttersand projectingradiallyfrom the turretand made adjustable as to length, of projection.In the plane of these stops32 and at the rear a stationarystop 33 is-arran ge d,-w-hich consists of a longitudinaliflange secured-to a bracket'34, which projects up from the :rear of the lathe, (see Fig. 3,) and sothatas the turret advances the stop beneath th'e'advancing cutterwillstrike thesaid flan ge when the full advance of the cutter is com--pleted, the stops 32 being adjustable .to vary the advance of thecutterasoccasionmay .require. These -stops,:combined with the flange 33,provide for depth of cut.

Insome cases diffieren-t'depthsof out are required to be made by thesame cutter-as, Y for illustration, the :collets Z) andc are ofdifferentdiameters, but theirsurface or periph ery maybe produced by thesame cutter. To permit such action of the same cutter, an independentstop, as 35, is provided for that particular cutter in a plane out ofthe plane of thestop-fiange 33, and in the plane of this stop 35 anindependent stop-flange 36 is provided, (see Figs. 1 and 3,) this flange36 presenting-a longitudinal surface, but with an offset, as at 37, Fig.1, thus presenting two stop-surfaces, according to the variationrequired for the depth'of cut. Thissame stopflange 36 may present anyirregularity in its edge and so as to serve as .a guide for the varyinglongitudinal movement of the turret. The stop working against the edgeof that flange-will vary this backward and forward movement, accordingto the irregularities of such edge and consequently produce a cut ofcorresponding shape.

To stop the longitudinal movement of the slide II at the properpositions for the opera- 1 tion of the tools on the turret, a rotatingshaft 3 38 is arranged in suitable bearings 39 beneath the slide II, theshaft being parallel with the path of movement of the slide. This shaftcarries at its end a ratchet-wheel 40, and on a the carriage a pawl 41is hung,which is adapt- 9 ed to engage the teeth of this ratchet as thecarriage retreats and as seen in Fig. 3, and i so that as the carriagecompletes its retreat a 1 partial rotation will be imparted to theratchj et-wheel 40. The ratchet-wheel 40 carries severallongitudinally-projecting pins, as 42,

43, 44, 45, 46, and 47, more or less in number,

according to the longitudinal stops required.

:(Here represented as six.) These stops roitate with theratchet-wheel40, and so-thatunider each rotation the position of the projectjingpinswill be changed. I

Stationaryon thelathe-bed -is a stop 48, :and this stop stands in theposition correspondingto the path of movementof one of the pins on thewheel.40-that is, so that these pins may be successively brought intoline with the stop 48. Consequently one of those pins beingin linewith-the stop 48 that pin will come against the stop 48 when the slidehas been moved so far longitudinallyas to bring thepi-n into contactwith the stop. EThese pins correspond in position to the re-' spectivetoolsand so thatouetool brought into aposition to operate its pin willbe at.

the=same time brought into line withthe stop .48, and .so that with thattool workingand the carriage movedlongitudinally the further operationof that tool will bearrested when the pin reaches the stop; or the pinsmay serve to locate'the tools --wi-th relation to the work to be-donethat is to say, if simply a radial cut is to be made. ticular toolwhich has todo that work will reach thestop when the position forthat-:tool to'opcrate is reached, and so that, the slide being held thusarrested by the stop 48, the tool may then be advanced to make its out.For illustration, the pins for the respective tools will comeagainst-the stop 48 when the tool which is to cut the sides of therespective collets is reached. In such case there is no longitudinalmovement'during the operation of the tool. It is simplya depth of cut.Again, in cutting thegudgeon 61 there will be a depth of out which willbe governed bythe stop-flange 33. A corresponding pin'will locate thecutter at the point where the shoulder is to be formed. Then alongitudinal movement therefrom will out that gudgeon. For the othergudgeon an adjustable stop 49 is arranged over the flange 33, projectingtoward the turret, and against which the stop on the turret will strikewhen the slide is moved to bring the tool for cutting that other gndgeoninto'the right position for the shoulder. Then that tool is advanced andmoved longitudinally to cut that other gudgeon.

In some cases more than a single operation is required to be produced bya single toolas, for illustration, the cutting down of the face 50 ofthe collet c, the cutting of the surface 51 of the collet b down to theshoulder e, and then the cutting of the surface 52 from the shoulder tothe arbor may be produced by the same tool and Without rotation of theturret, the change of position of the tool longitudinally being all thatis required. To accomplish this object, the rotation of the turret isprevented by providing a stop which will arrest its retreating movementbefore the dog 16 is brought into operation upon the turret. This stopconsists of a verticallymovable dog 53, arranged in the slide H, as seenin Fig. 4, the dog being provided witha Then the pin of the parspringthe tendency of which is to hold the through the upper surface of theslide and so as to stand in the path of the retreating carriage, asrepresented in broken lines, Fig. 4, and which will serve to arrest theretreat of the carriage before it reaches the stop 18. This point ofarrest of the dog 53 occurs before the dog 16 can come into operation.

To bring the dog 53 into operation at the required time, a cam 54. isarranged on the wheel 40, so as to revolve with it, and upon the underside of the slide H is alever55, arranged to swing in a horizontalplane. One arm of this lever is adapted to pass below the lower beveledend of the dog 53 and so as to force the dog upward, as indicated inbroken lines, Fig. 4. Normally,however,this end of the lever stands sofar away from the dog 53 as to permit that dog to stand in the downposition. The other arm of the lever extends into the path of the cam54, as seen in Fig. 1, and so that as the cam 54 advances under therotation of the ratchet-wheel 40 it will strike the projecting arm ofthe lever 55 and turnthat arm outward, as seen in broken lines, Fig. 1,and so as to bring the otherarm of the lever onto the beveled end of thedog 53 and correspondingly force that dog upward, as before described,that its upper end may stand in the path of the retreating carriage toarrest it, as before described, and so long as the cam thus holds thelever with the dog raised the reciprocating movement of the carriage andturret may continue without producing rotation of the turret. The lengthof this cam is therefore made according to the number of reciprocatingmovements which it is desired the carriage and turret should re ceivewithout change of tool. So soon as the lever escapes from the cam thedog 53 drops and leaves the carriage free to resume its full movement,by which rotation will be imparted to the turret. The rotation oftheratchetwheel continues, notwithstanding there is no rotation of theturretyfor the reason that the extent of movement of the tool for eachoperation is varied, and therefore requires an independent pin for eachmovement. As the pawl 4.1, which operates theratchet, necessarily moveswith the carriage, and because of the stopping of the carriage beforethe eX- treme rear position is reached, as before described, it isnecessary that the dog should escape from the ratchet-wheel before theextreme retreat of the carriage is reached, otherwise the dogbeingengaged with the wheel 40 would turn the wheel to a greater extentwhen the carriage made its full'retre'at than when it was stopped priorto such extreme rear position. Therefore to produce the proper action ofthe pawl upon the ratchet, it is thrown out of engagement with theratchet so soon as the required movement of the ratchet is made. To thusthrow out the pawl a finger 56 (represented in broken lines, Fig. 3) isattached to the pawl and is adapted to' ride upon the shaft 38. Thusriding upon the shaft the pawl is out of engagement with the ratchet, asseen in Fig. 3; but when the carriageadvances the tinger escapes fromthe shaft and drops, as seen in Fig. 3, so as to bring the pawl intoengagement with the ratchet that on the next retreat of the carriage itwill impart a step in rotation to the wheel 40, and so soon as thatrotation is accomplished the back of the finger strikes the shaft 38 andoperates as a cam to throw the pawl -11 out of engagement with the wheeland leave it free to retreat with the carriage without effect upon theratchet-wheel 40, as seen in Fig. 3; but this escape of the pawl fromthe wheel must occur on or before the carriage will reach the positionto be stopped by the dog 53.

As the article is placed in the lathe for turning-such, forillustration, as the arbor represented in Fig. 5-it is a common practicein hand operation for the workman to place the end of his tool beneaththe arbor or article,and, using his tool as a lever over the rest, bearupward upon the article while it is revolving rapidly, which will bringthe article to a true and central line. This truing up is as desirablein a lathe with the turret attachment as when the work is to beperformed by hand.

To provide a means for thus truing up the work, a sliding finger 57 isarranged at the rear of the mandrel and spindle and so as to move in aline at right angles to the axis of the article to be operated upon. Aforwardand-back movement is imparted to this finger by means of ahand-lever 58, hung upon a fulcrum 59 below and connected to the fingerat its rear end and so that by pulling the lever forward the finger willbe advanced, or forcing the lever backward the finger willcorrespondingly retreat. The finger works through a post 60, and at itsforward end the upper side is inclined upward and rearward and so thatas the finger advances it will pass. under the article in the lathe tobe operated upon, that article revolving, and so that the inclinedsurface will produce an upward force upon the revolving articlesubstantially the same as does the lever-like action of the tool in thehand of the operator, as before described and as represented in brokenlines, Fig. 3. The elevation of this finger may be adjusted withrelation to the diameter of the article in the lathe, and this may beaccomplished by raising or lowering the stud 61, which stands beneaththe finger and over which the finger moves.

The illustration of the invention as adapted for turning clock-arborswill be sufficient to enable others skilled in the art to adjust thelathe for various purposes to which it is adapted.

, While preferring the mechanism hereinbefore described for imparting tothe turret its rotative movement, it will be understood that IIO any ofthe known mechanisms for performing this operation may be substitutedtherefor. The invention is therefore not to be understood as limited toany specific mechanism for imparting the intermittent rotationto theturret; but

What is claimed is i 1. As an attachment for a lathe, the slide arrangedon the bed and adapted for longitudinal movement thereon, the carriageon said slide arranged for reciprocating movement in a path at rightangles to the path of movement of said slide, a turret on said car--riage adapted to rotate upon a vertical axis, mechanism, substantiallysuch as described, between the said slide and turret, whereby under thereciprocatingmovement of the car-v riage and turret a rotativemovementwill be imparted to the turret during the last part ofitsretreating movement, a ratchet-wheel arranged upon said slide and in aplane parallel with the path of movement of said carriage, a pawl onsaid carriage adapted to engage the teeth of said ratchet, the saidwheel provided with a series of pinsprojecting longitudinally therefrom,and a stationary stop against whichsaidpins are adapted to successivelybear to arrest the longitudinal ,movement of the slide, substantially asdescribed. f 2. As an attachment for lathes, the combination of a slideH, arranged to move longi tudinally on the bed of the lathe, a carriagem, arranged uponsaid slide to reciprocate in, a path at right angles tothe path of movement of said slide, mechanism, substantially such asdescribed, to impart rotation to said; turretduring the last part of theretreating movement of the carriage, a stop upon the slide adapted toarrest the movement of the carriage at its extreme retreating position,and a dog, as 53, arranged in the slide andf adaptedtto'betbrought intopositionto arrest: the carriage before it reaches its extreme rearmovement,a ratchet-wheel 40, supported in said slide and so as tomovetherewith, a pawl on thecarriage,arranged to engage the said ratchet inthe retreating movement of the carriage, thesaid ratchet-wheel providedwith a series of pins projecting longitudinally therefrom andcorresponding to more or less of-the tools in the turret, with a stopagainst which said pins are adapted tobear at a pre-j determined pointin the longitudinalmovement of said slide, anda lever 55, adaptedtooperate upon said dog 53, with a cam 54 on said l'atchehwheel, arrangedto engage the said lever 55 ata predetermined point and forapredetermined length of time, substantially; asdescribed. 3. Asanattachmentfor a lathe, the combination of a slide arranged onthe bed ofthe latheand so as to be moved longitudinally thereon, a carriagearranged on said slide and so as ,to reciprocate in a path at rightangles to the path of movement of said slide, a turret tially asdescribed.

t. As an attachment for a lathe, the combination of a slide arrangedupon the bed of the latheand so as to be moved longitudinally thereon, acarriage arranged upon saidpslide and so as to reciprocate in a path atright angles to the, path of movement of the said slide, a turretarranged upon said carriage upon a vertical axis and so as to, rotatethereon, mechanism between saidslide andturret, whereby rotativemovement will be imparted to said turret during the last part of theretreating movement of said carriage,a finger arranged at the rear andso as to slide backward and forward toward the turret, and mechanism,substantially such as described, to impart said sliding movement to saidfinger, the said'finger constructed with an upward and rearwardlyinclined surface at its forward end, substantially as and for thepurpose described.

5. In a turret attachment for lathes,'the combination of the slide l-I,arranged upon the bed of the lathe and so as to move longitudinallythereon, a carriage m, arranged gup: on said slide and so as to reciprocate in a path at right angles to the path of movement of said slide,a turret arranged upon said carriage andso as to rotate upon a verticalaxis thereon, the turret carrying a seriesof tools, mechanism betweenthe slide and turret,

whereby a rotative movement is impartedto said turret during the lastpart of 'the retreating movement of said turret, a leading-screw N,arranged below but parallel with the path of said slide, said screwhavinga portionof' its thread right hand and another portion of itsthreadlefthand, stirrups S and T,'l1ung to said slide and carriage,respectively, and'halfnuts W and IR, adapted to engage the,corresponding threaded portions of said screw,-with mechanism,substantially such as described, to draw. said nuts into and take themout of engagement with their respective portions of the screw,substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

FREDERIC A. LANE.

Witnesses.

FRED C. EARLE, LTLLIAN D. KELSEY.

IIO

